Essays on Action Potential

1.Diaphoresis is a medical condition of the body that an individual often sweats because of a drug side effect or symptom of a disease. Motor dysfunction has associations with the nerve and muscle center responsible for movement; this term defines the improper functioning of the muscle. Cyanosis is a condition related to the low supply of oxygen in the blood where the skin color of an individual as well as mucous membranes appears to have purple or blue coloration. The peripheral nerve connects the central nervous system and the brain to the entire body neurons; any damage or pressure ...

Muscle contraction is a very important activity that enables an organism perform various bodily movements and flexible actions, in response to nerve stimuli. Muscle fibers are multinucleated long cylindrical cells that have an outer membrane called sarcolemma, and are mainly composed of contractile elements called myofibrils (Dougherty, 2016). Myofibrils are made up of repeating units called sarcomeres. Sarcomeres in turn are composed of (thin) actin and (thick) myosin protein filaments called myofilaments (Dougherty, 2016). The muscle fiber structure and organization is shown in Fig 1.

Contraction Mechanism – Sliding Filament Theory

According to the sliding filament theory, during contraction myosin filaments remain constant in length, ...

A neuron is a specialized type of cell that helps in impulse conduction in the body. It is a basic unit of communication in the body. It receives and initiates the information reception and transmission to all parts of the body. The structure of the neuron is made of several parts that include dendrites, Soma (cell body), nucleus, cell membrane, axon, myelin sheath, a node of Ranvier and terminal Buttons or axon terminal (Marieb, 2004). The figure below shows the structure of the neuron. Figure 1: structure of neuron (Shonkoff & Phillips, 2010). For neural impulse to occur, the stimulus ...

Surgical Anesthesia

Pharmacology and Indications Licocaine Licocaine is a type of medication used with an aim of numbing tissues and nerves within a given area of the body, which provides that anesthetic effect for the body. The most popular brand names for this particular drug are xylocaine and lignocaine. Some of the common effects associated with this particular medication include drowsiness, muscle twitching, nausea, and confusion (1). The severity of the side effects depends wholly on a patient’s reaction to the chemical composition of the drug. Regarding its mode of action, licocaine works by blocking the voltage-gated Na+ channels, which ...

ICU Observation Evidence-based Practice

ICU Observation Evidence-based Practice

Introduction of the Patient

The patient goes by the name T.P. A 72-year-old male who’s a retired truck driver. He’s immediate family includes his wife, daughter, and grandson (10 years old who is autistic and has turrets syndrome). He is currently diagnosed with myocardial infarction and altered mental state. The past medical history of this patient shows that he has suffered a lot of diseases including hypertension, diabetes mellitus Type 2, congested heart failure, peripheral neuropathy, CKD-3, CAD, dementia, chronic kidney disease and GERD.

The primary medical diagnosis is myocardial infarction which refers to regional myocardial necrosis ...

Introduction:

The experiment is about measuring the capacity of neurons in given factors using the cockroaches’ leg. Neurons are very important in a living cell. It gives power to all parts of the system. It transmit signal to every inch of a muscle up to the other end organs. It comes in various sizes, but basically they have the same function in almost all cells. The main structures of the neuron are composed of cell body, which has the metabolic function; the dendrites that usually receives the signal from other neurons; and lastly the axon that sends signal to the ...

BIOL 3810.506

Compound Action Potential of the Bullfrog Sciatic Nerve TA: Vinoo Urity Introduction One of the primary and unique characteristics of action potential is that it can be “simultaneously elicited in every axion through electrical stimulation.” This scenario is referred to as CAP (compound action potential) which is artificial, collective nerve response. The action potential amplitude for every individual axon does not change alongside stimulus intensity, but increases alongside the CAP amplitude at higher stimulus voltage which includes other axons existing within the same nerve reaching their own threshold.

Materials and Methods

In this experiment, the sciatic nerve is removed from a frog ...

There is a lot of focus and puzzles on hypoxic drive in the modern society. What is hypoxic drive and what are the processes that facilitate it? Hypoxia refers to a condition where there is lack of oxygen in a part of the body or the entire body. In this condition, the patient’s body utilizes oxygen chemoreceptors rather than carbon dioxide to regulate the respiratory cycle (Greaves et al. 120). This essay discusses biochemical, physiological, epidemiological, and clinical evidence to support hypoxic drive in the chronic hypercapnia patient (Galvagno 58).

Macro and micro neural circuity involved in respiratoty/ventilator drives and pattern generation

Rhythmic respiratory movements originate from neutral activity. Specialized ...

DISCUSS THE ROLE OF ION CURRENTS IN DETERMINING THE SHAPE AND DURATION OF CARDIAC ACTION POTENTIAL

Introduction Selective permeability to various ions is an important characteristic of cell membranes, one that determines myriad cellular functions. In animal cells, ion permeability and the electrical potential generated thereof determines the activity of neurons, myocytes and the like. The electrical potential depends on the concentration of the ions inside and outside any given cell, the permeability of the cell membrane to the ions and the ion channels that are present on the surface of the cell. Cardiac cells also possess different ion channels on their surface. These determine the two types of electrical potentials, namely, resting membrane ...

Definition of Some Terms

- Resting membrane potential: term denoting that Em is about -70mV - Depolarization: reversal of Em due to influx of sodium ions - Sodium (Na+): major extracellular cation - Threshold: minimal stimulus needed to cause an AP - Absolute refractory period: cell membrane insensitive to stimuli. - Potassium (K+): major intracellular cation

Answers to Questions

Describe a synapse, and include definitions of the pre- and post- synaptic neurons. A synapse is an anatomically specialized junction between two neurons, and it is where one neuron alters the activity of another. A presynaptic neuron conducts signals toward a ...

When a muscle is stimulated, do all motor units fire? Why, or why not?

Not all motor units fire when a muscle is activated. This is because in the reflex, not all motor units are activated (Brown et al, 2006).

1b). Explain how the force of contraction changes with recruitment.

The force of contraction depends on the activation of muscle fibers. When more motor fibers are recruited, a greater contraction force results (Zatsiorsky & Kraemer, 2006). The stimulation of the smallest muscles such as the slow twitch fibers result from the recruitment of the smallest motor nerves which, occurs first (Zatsiorsky & Kraemer, 2006).

1c). with continues recruitment, is there a point at which there is ...

Human behavior is determined by the interplay of several factors; individual genes and the environment are some of the leading factors in determining personal traits and tendencies. However, although inheritance and the environment play the greater role in determining an individual’s behavior, hormones as well as neurotransmitters also play crucial roles in shaping one’s behavior. Some hormones, for example, are linked with controlling anger and aggression in both men and women, while other sets of hormones are linked with the control of sleep. Hormonal imbalances are also linked with the control of individual temperaments. Hormones exert their ...

1. As we know bone is a hard tissue so in comparison to other tissues the vascularization and how it gets nutrients in general is unique and different from any other part of human body. A bone is blood supplied by three different systems, these are: Nutrient artery, Periosteal vessel, and epiphyseal vessels. The first layer covering any bone tissue is periosteum. Periosteum is a thin membrane, covering the outer surfaces of all bones. It contains an extensive network of blood vessels, and it’s small branches penetrate into the bone through minute channels, these branches supply the outer ⅓ of cortex. ...

According to Brains Basic (n.d), neurons (nuerones) form the fundamental “data processing units” or the 'chips' of the brain. Neurons get “electrical inputs” from nearly one thousand different neurons. These impulses arrive at the same time, and when combined, they become 'nerve impulse'. This impulse then creates a reaction in the next “neuron” in the system. Neurons react to conduct and stimuli because a probable membrane is formed across the membrane in the cell. It can be noted that the neurons are emotional cells that are present within the body’s nervous system. It serves to ...

- The human nervous system may be categorized into two divisions namely PNS and CNS. The nervous system has three broad functions which include sensing changes in the body as well as within outside environment; interpreting changes as well as establishing suitable response depending on reflexes, current conditions and experiences; and responding to interpretation through initiating action by glandular secretions (Paxinos, 2010). The PNS link the spinal cord and brain with receptors, glands, and muscles.

- Nerve impulse or action potential is an electrical signal which travels along the neuron resulting from entry of ions into neuron and altering ...

Introduction

The neurophysiology of nerve pulses in the cell were the subject of the online laboratory experiment in order to better understand neuron communication from inside a cell to the outside of a cell. One of the incredible characteristics of the nervous system is its capability to communicate due to the existence of neurons. Neurons show a measurable response to their environment by producing an electrical signal. We can smell due to olfactory sensory neurons that can directly react to perfume, food or anything with an odor; these odors are the sensory stimuli. The function of the receptor potential is to trigger an ...

Lesson 5 Answers:

24.) Plants are classified into four major groups: Bryophytes, Pteridophytes, Gymnosperms and lastly the Angiosperms. Bryophytes are the plants that do not have true vascular systems, which consist of the xylem and the phloem. In this group, includes the mosses, liverworts and hornworts. Together, they are considered as land plants that reproduce their own asexually by producing spores. Spores are produced in the ‘sporangium’ (plural sporangia), a bulb-like structure located at the top of the stalk. It can only be seen through the use of high powered microscope. Because they lack vessels that can bring the nutrients from the roots ...

The nervous system can be divided into two groups: the central nervous system (CNS), which comprises of the brain the spinal cord, and the peripheral nervous system (PNS), which consists of the nerves. Nervous tissue consists of two types of cells: the nerve cells and supporting glial cells (or simply glia). Glia have different types and outnumber nerve cells. In the CNS, astrocytes provide structural support for neurons, regulate the extracellular concentrations of neurotransmitters and ions, and facilitate information transfer at synapses. Radial glia is critical in the development of the nervous system. Both astrocytes and radial glia can ...

Question 1

The cerebellum is an essential part of the neuromuscular system in that it plays major roles in the timing of muscular activities and the smooth progression of one muscular movement to the next. The summary of how this is done is that it sequences all the muscular activities necessary for a particular movement, and then makes corrective adjustments as necessary when the movement is being executed so that they conform to the motor impulses being generated by the cerebral cortex and other significant parts of the central nervous system (Ganong, 2005). For instance, for an individual holding a cup and ...

Ahmad Al-Obaidly

Abstract—In this experiment, a hand dynamometer was used to measure the grip strength of a subject. The forearm muscles were engaged in an activity, and the grip recorded. The electromyogram (EMG) activity was related to the grip strength by making a graph of the maximum grip strength against area under the EMG activity’s absolute integral during the contraction of muscle. Data was recorded from the dominant and non-dominant forearms of the subject and the electrical activity of each forearm compared to its diameter. Prolonged grip strength was also recordings and forearm EMG activity made to determine fatigue rate in both ...

Nervous System

1. Neurons communicate with other neurons and stimulate both glands and muscles. 2. Match the following parts of the neuron and their function:

Dendrites input area, receives signals from other neuron conductive region; generates an action potential Soma (cell body) input area; main nutritional and metabolic area input area; receives signals from other neurons Axon conductive region; generates an action potential input area; main nutritional and metabolic area 3. Signals from other neurons are received at junctions called synapses, located primarily on the dendrites and cell bodies, the receptive and integrative regions of the neuron. ...

a) Explain why the effort of hormonal (Endocrine ) control tends to be slow whereas nervous control is usually very fast.

Endocrine control is normally slower when compared to nervous control majorly because hormones once released by the endocrine gland have to travel via the circulation to reach their target receptors on the effector organ which generally takes more time. Meanwhile, information relayed by nerves is in form of impulses (that is, action potentials generated due to electrical excitation produced by a change in the charge across the surface membrane of the neuron evoked by the stimuli) that simply travel along the ...